Jake Letori, the marine scientist who runs the baited camera research, said the cameras give an insight to natural shark behaviour.

He explained: "You can get 12, 15 or more grey reef sharks circling the canister, taking turns to come down. Some go straight for the bait canister, rip it off, or lift up the rig."

Image:Sharks swimming around a baited camera near Aldabra

The coral in Aldabra has recovered far more quickly than in other Seychelles islands from the 2016 bleaching event when warm water spread across the Indian Ocean.

It's thought the ban on commercial fishing means there's plenty of herbivores to graze on algae that would otherwise smother the reef.

Image:April Burt is a researcher on the island

April Burt, from Queen's College Oxford, is studying the reef. She said strict marine protection can take the pressure off coral.

She said: "Aldabra may act as a nursery, a place where coral will be able to spew out their larvae to repopulate those other areas that are not so lucky to be protected.

"That may ensure the persistence of coral reefs in the future."

:: Sky News will broadcast live from 300m down in the Indian Ocean at 8am on Monday, Tuesday and Wednesday. The series will examine the impact of climate change and plastic pollution. It includes the deepest-ever live news programme from submersibles.

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